Description
This page contains the results for the effects of spill (as the days
of spill in winter) on key movements. Days of winter spill are
calculated as the total number of days in January, February, and March
that had any amount of spill. As a reminder for how spill (days of
winter spill) is included in the model, spill (as the number of days of
winter spill) affects only post-overshoot fallback movements. The same
parameter is shared by all fish of the same DPS/rear type combination
for which the movement represents post-overshoot fallback. On this page,
I will focus only on how spill (days of winter spill) affects
post-overshoot fallback.
NOTE: These are results where we still have both a random
effect of year and an effect of winter spill days on post-overshoot
fallback movements. I am currently running the updated models where we
have dropped the random effect of year for these movements, and will
update these results when they are ready. I am hoping this will fix the
poor fits to data that we currently see for some movements.
Calculation
For each dataset (combination of DPS and rear type), the following
steps were run:
- Extract the median covariate values experienced by all fish in the
dataset (for volume of spill and temperature). These median values are
used to estimate the probability of movement.
- Create a sequence of days of spill from 0 to the maximimum value
experience by fish in the dataset.
- Evaluate the probability of movement at each of those spill
values.
If a tributary has both a hatchery and natural origin population,
they are shown on the same plot. The bubbles indicate the proportion of
fish that were observed to make this movement at each number of winter
spill days, where the fish was also in the upstream state during the
winter months.
Middle Columbia
Effect of days of winter spill on post-overshoot
fallback at McNary Dam for Deschutes River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at McNary Dam for John Day River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Priest Rapids Dam for John Day River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Ice Harbor Dam for John Day River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at McNary Dam for Fifteenmile Creek Steelhead.
Effect of days of winter spill on post-overshoot
fallback at McNary Dam for Umatilla River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Ice Harbor Dam for Umatilla River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Priest Rapids Dam for Umatilla River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Priest Rapids Dam for Yakima River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Ice Harbor Dam for Yakima River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Priest Rapids Dam for Walla Walla River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Ice Harbor Dam for Walla Walla River Steelhead.
Upper Columbia
Effect of days of winter spill on post-overshoot
fallback at Rocky Reach Dam for Wenatchee River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Wells Dam for Wenatchee River Steelhead.
Effect of days of winter spill on post-overshoot
fallback at Wells Dam for Entiat River Steelhead.
Snake River
Effect of days of winter spill on post-overshoot
fallback at Lower Granite Dam for Tucannon River Steelhead.